21 Items: Know What’s Illegal to Mail in Colorado

Colorado is paying more than ever for stamps and shipping services in 2025. I love my local USPS workers, but I can not remember the last time I had a priority mail package arrive at its destination on the day promised to me at the time of payment, especially if the destination was Denver.

Did you know that certain items are not allowed to be mailed in Colorado, no matter how much you are willing to pay for them? Let's run down the list.

21 Items You’re Banned from Mailing in Colorado

Are you planning to mail a package from the post office in Colorado? Take a moment to look over the photo gallery below, which includes twenty-one items banned for delivery in Colorado by the United States Postal Service.

Gallery Credit: Wesley Adams

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Mail Restrictions in Colorado

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The list of prohibited items the USPS forbids you from mailing are items that are simply dangerous. No one needs to mail explosives, ammo, gasoline, or dangerous chemicals.

Likewise, restricted items like aerosols, alcohol, and guns require specific conditions and proper packaging. Live animals are also a restricted item. Sending marijuana to someone in the mail is against federal law, regardless of Colorado's laws.

Additional Shipping Options in Colorado

Items that are not allowed to be delivered via USPS may be able to be delivered by a special carrier. UPS (United Parcel Service) may accept firearms from shippers who have a federal license and approved UPS agreements to do so.

Local delivery services that work within Colorado’s borders and shipping laws may be hired as a courier for certain items. A final option may be that it is best to deliver an item via in-person exchange.

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MORE: 13 Things That Are Illegal to Do in Colorado

Feel like letting your hair down this weekend in the Centennial State? Have fun! Just be sure to avoid any of these thirteen illegal activities that will get you into trouble in Colorado. Which illegal activity in the gallery below surprises you the most? Open our station app and let us know.

Gallery Credit: Wesley Adams

NO: It Is Illegal To Throw These Things Away In Colorado

There are 14 items that should never be thrown out with the trash in Colorado. Check out this helpful list of hazardous waste reminders that should never go in the garbage in Colorado. While some of these items can be turned in on local hazardous waste collection days, six items on this list can get you into big trouble if you are caught dumping them at a landfill.

Gallery Credit: Wes Adams

Source: You Can’t Mail Any of These Illegal Items in Colorado

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Categories: Articles, Colorado Local